Results 1 to 50 of 130
Threaded View
-
01-01-2011, 03:48 PM #9
Re: Home made swimming pool heat pump
Excellent information, thanks. Re the high/low pressure switches, what pressures would you expect to see. I assume these switches are at preset pressures. From what I have read refrigerant pressure is related to differential in temperature so a 'working pressure' is impossible to determine unless the temperatures are known. So, I would assume that the switch would operate in case of excess pressure, but what pressure is classed as excess pressure and, as it is not a DC compressor how can the pressure be regulated?
Interestingly, studying the circuit of the unit that this 'split' came from the outdoor unit is very simple - it is simply switched on and off by the control board and has no feedback of information to the control board or any apparent safety features. It has an outdoor thermostat to control the fan and that's about it.
The internal unit has a pipe temperature and room temperature thermistor and that's it. There are no pressure sensors anywhere. Is this normal on older machines, this machine seems to be from around the mid 90's.
Re the system pressures equalising, surely in a non operating state there are no pressure differentials throughout the system and everything is in equilibrium, starting the compressor generates that differential and refrigerant starts to circulate or am I missing something?
Thanks for the information,
Nigel
Similar Threads
-
Seeking Tips on Getting the Most from a Heat Pump
By kenelias in forum New to REReplies: 4Last Post: 29-11-2010, 08:52 PM -
Pool Heat Pump
By elvis in forum Heat PumpsReplies: 5Last Post: 23-03-2010, 09:18 PM -
Capacity control
By sparrow in forum TrainingReplies: 44Last Post: 18-01-2010, 07:49 PM -
Home designed and built heat pump!
By The MG Pony in forum Heat PumpsReplies: 15Last Post: 17-08-2007, 02:01 AM -
Heat pump made from a TM-15HD?
By The MG Pony in forum TransportReplies: 8Last Post: 18-05-2007, 07:37 PM